Yes, indeed. Last tiem I checked, they are asking north of $1K for the heads... But they are truly unusual in a sense that you put it next to the retail ones and you notice it is an entirely different design. The only thing they share is the cosmetics as you get to stick the logo in the cavity yourself. Yes, they come to you blank and you get to stick them all yourself!

FT-9TA... I think they are only about 420cc, which should appeal to you once you wore out all the 510TP...